Difference between revisions of "GBrowse syn Help"

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Revision as of 14:42, 7 January 2009

GBrowse_syn User Interface Help

GBrowse_syn is a GBrowse based synteny viewer. This page provides help on using GBrowse_syn. See the GBrowse_syn page for other information on GBrowse_syn.

Search Section

GBS Search Section.png

Landmark

GBS Landmark.png

  • The landmark input box accepts segment labels in the form:
reference sequence:start..end
  • In some cases, gene names and other landmarks can also be entered. Support for searching other classes depends on the configuration for the species' data source.
  • Note, make sure you have selected the correct reference species before clicking the 'Search' button.

Reference Species

GBS ref Species.png

  • This is the species that occupies the center panel in the alignment display.
  • Alignments for other species are shown with reference to this coordinate system.
  • Select the species from the pull-down menu and check boxes (see below) to select which species should be aligned to the reference sequence.

Aligned Species

GBS aln Species.png

  • Configured species (except for the reference species) for the selected data source will be listed here.
  • By checking each box, you indicate that alignments for this species, if available, should be displayed relative to the reference species.

Data Source

GBS Datasource.png

  • This pull-down menu lists all available data sets configured for the synteny browser.
  • Each item in this list corresponds to a sourcename.synconf configuration file.
  • If only one data source is available this menu will not appear.

Display Mode

GBS Display Mode1.png   GBS Display Mode2.png

  • The default display mode shows the reference species plus two aligned species per panel and repeats the display panel as many times as required to display all aligned species relative to the reference species.
    • This mode is best suited to displaying all sequences on roughly the same scale.
  • The other display mode is a summary view that shows all species in a single panel.
  • The display mode can be toggled between expanded and compact by clicking the link shown above or via a pull-down menu on the "Display Settings" section
Display mode: Refence species plus two aligned species/panel; repaeted until all aligned species are shown
Display mode: All species on a single panel


Display Settings

GBS Display Settings.png

Image widths

GBS widths.png

Image options

Chain Alignments

GBS chain.png

  • GBrowse_syn uses a dynamic programming algorithm to assembled aligned regions into chains.
    • If alignments are on the same strand on the same reference sequence and their coordinates increase (or decrease) monotonically, they are assembled into a meta-alignment, which is indicated by dashed connectors.
    • Chained alignments may have other alignments in the intervening gaps.
  • This feature is useful for displaying small rearrangements, such as translocations, nested inversions, etc.
Chained aligments
Unchained aligments


Flip Minus Strand Panels

GBS flip.png

  • Choosing the flip option makes it easier directly compare the aligned regions.
  • Otherwise, in alignments is on the negative strand, relative to the reference, the grid lines and shaded polygon will cross-over to indicate inversion
Reverse strand panel (C. briggsae) flipped to facilitate direct comparison of gene order
Reverse strand panel keo in original orientation


Grid Lines

GBS lines.png

Edges

GBS edges.png

Shading

GBS shading.png